Apparatus for making hallow articles from plastic material.



E. J. FRAENKELL.

HOLLOW ARTICLES F APPLICATION FILED JUNE 5. I

APPARATUS FOR MAKING ROM PLASTIC MATERIAL. 9|]- Patented July 23, 1918-.

T UNITED STATES PATENT OFFICE.

EUGEN J. 'FRAENKELL, OF NEW YORK, N. Y.

.arranaros FOR MAKING nonnow narrows mom Specification of Letters Patent. Application filed June 5, 1917. Serial No. 172,848.

To all whom it may concern:

Be it known that I, EUGEN J. FRAENKELL, a citizen of the United States, residing New York, in the county of N ew,York and State of New York, have invented certain new and useful Improvements in Ap aratus for Makin Hollow Articles from lastic Material, which the following is a specification.

This invention relates to apparatus for making hollow articles from plastic material, and one of the objects of the invenpreferred form a the same with parts eferring to the numerals on the drawparts of the mold heater I principles constituting t1on 1s to provide a method of cheaplyv and Another object is top well adapted for ther ob ects and aims of the invention,

arrangements of parts, and applicationsof the invention; and the scope of protection contemplated will appear from the claims.-

the accompanying drawings, which are to be taken as a part of this specification, andin which I have shown a merely of embodiment of the in- 1 is a plan view of an apvention, Figure practice of my invention,

paratus for the showing parts section; and Fig. 2 18 8, sectional view of in elevation.

ings, there is indicated at 4 a suitable table or support upon which is a mold heater 5, which may be hollow as shown, and provided with inlet 6 or the like for heating. heater 5 will have a steam a conformation approriate to the article which is to be manuacturede. For instance, referring to Fig.

2, the mold heater is divlded into two parts,

the one on the left havin aconformation to correspond with the bac of a dolls head, and'the one on the right corresponding with the face part of a dolls head.- Th

. parts of a dolls head, respectively. The mold is provided with pro ections" 9, one on each s de, and

broken away and parts in The upper surface of this mold introduced the the forms are pro ections 9 of the 'table and the -of the been roperly pressed 4 tions PLASTIC MATFJFIAL. Patented Jul 23, 1918.

the mold 8 is provided with sockets 10, one on each side. Into the molds 7 and 8 is plastic material of which the dolls head is to be made. The material is introduced in the mass, and is to be spread out to a uniform thickness over the interior surfaces of the molds. This shaping is'accomplished by means of forms 11 and 12, which are also preferably hollow and which correspond in shape to the molds 7 and 8, res ectively. These forms 11 and 12 are detac iabl secured to the respective mold sections and 8. For instance, in the drawings each mold section is shown provided on opposite sides with pins 14, and shown provided on, opposite sides with hooks 15 which are to enga e over the pins. In Fig. 2 the form 11 on t e left is shown prior to the engagement of its hooks 15 with the pins 14 of .the mold section '7, while the form 12 on the rig that figure is shown with the hooks of the form properly engaged with the pins of the mold section 8. In order to? insure roper alinement of the respective forms an sections, each mold section may have a socket 16 and the corresponding, form a projection 17 cooperating therewith. Furthermore, the form 7 on the left has on opposite sides sockets 18, with which the mold section 7 may 00- op'erateto hold the mold section 7 and the form 11 in proper alinement; while the form 12 on the right has a proi'ection 19 to enter the socket 10 on the mo (1 section 8. In order to hold the forms'll and 12 in proper pressin relation within the mold sections, each orm may have a handle 20', and in order that the operator may not. have to hold the compression by hand, I may rovide springs or the llke means 21 exten ing from the .tab 0 4' and having hook 'ortions 22 to engage over the handles 20. 'l his spring connection 21 between the form yieldingly holds the lace so that in case of expansion Fastic mass between the form and the mo d section the form is allowed to move in accordance with said expansion.

Assuming that the plastic material has within the mold secand 8 and uniform] distributed bean the correspondform in tween the mold sections ing forms so that it has received the general outlines of the two parts of the complete article, the two parts of the articleare next heater 5; the material 12 ma y to be joined together. Accordingly, the forms lland 12 are detached from the mold sections and removed, and then the mold sections, which are pivoted together as indicated at 24, are brought together, the

rojections 9 of the mold section 7 entering the sockets 10 of the mold section 8. These mold sections will be made so that when brought together the joint between them will besubstantially tight, and so that there will be an opening defined between the outer ends of the mold sections. Through this opening fluid pressure is to be introduced into the interior, resulting in the proper union between the plastic sections of the article, the abutting edges being united under the fluid pressure and because of the plastic condition-of the material. It will be understood that the material is maintained in thisthe mold heating of because of and to assist in this plastic condition is going on, each of the hollow forms 11 and have interiorl'y thereof gas burners 25. Also, the fluid pressure employed in uniting the mold sections ma be, for instance, steam,from which wou d be derived heat. as well as pressure. Instead of steam or other fluid applied directly to the interior of the closed mold I might introduce a rubher bag or the like expander, shaped apgggximately to the interior of the mold.

ere steam or used directly made to back I claim: 1. In combination,

provision must of course be the fluid inlet.

mold sections pivotplurality of pivotally While the preliminary forming the like fluid pressure is.

ally connected together, and corresponding forms detachably secure to'the respective mold sections, the mold sections and forms having inter-engaging parts, and certain of said parts of the mold sections adapted for inter-engagement when the forms are detached from the mold sections and the sections are swung upon their pivots.

2. In a molding apparatus comprising a mold section, outstanding'pins arranged on opposite sides at one end thereof, responding form associated with the mold section provided with oppositely disposed books at one end adapted to engage under the pins on the mold'section and at its opposite end a means for yieldingly holding the form in its proper section. I

3. In a molding apparatus comprising a connected mold sections each section constituting a portion of a complete article, corresponding forms-independently secured and adapted to be removed when the said sections are swung upon their pivot to bring the portions together to form the complete article.

4. In a molding apparatus comprising a mold section, ciated therewith and having an interlocking connection at one end with said section and a yieldable connection between the core, and the section at its opposite end for holding the core in its proper relation to the molding section.

relation to the mold to the mold sections a corresponding core asso- 

